Apparatus for rolling shapes.



G. G. MOMURTRY- APPARATUS FOR ROLLING SHAPES. APPLICATION FILED no.1.1908.

1 ,02 1 468, Patented Mar. 26, 1912.

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1,021,468. APPLICATION IILEDDEG. 190a. a Patented M31126 1912.-

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GEORGE G. MCMURTRY, OF NEW YORK, N. Y.

APPARATUS FOR ROLLING- SHAPES.

Specification of Letters Patent.

Patented Mar. 26, 1912.

Application filed December 1, 1908. Serial No. 465,524.

To all whom it may concern Be it known that LGnonon G.MCMURTRY, of theborough of Manhattan, city of New York, State of New York, have inventeda new and useful Apparatus for Rolling Shapes, of which the following isa specification, reference being had to the accompanying drawing,forming part of this specification, in which Figure 1 is a plan viewshowing the mill in diagram; Fig. 2 is a longitudinal section thereof;Fig. 3 is a longitudinal section on a large scale showing two of thestands of finishing rolls; Fig. 4 is an end elevation of one of thestands of rolls shown in Fig. 3 and Fig. 5 is a horizontal section orplan view of Fig. 3.

My invention relates to an improvement in universal mills for rollingflanged beams.

The practice of reducing the metal by passing it back and forth throughthe rolls a suflicient number of times to bring it to the desired finalshape has resulted in a serious difficulty due to the fact that a largeproportion of defective beams was PIO.

duced, stresses being set up especially at the angles between theflanges and webs of the beams which developed cracks or imperfections.It has also been found that the ends of the pieces of metal rolled onsuch mills become colder than the middle portions and afford greaterresistance to reduction by the rolls. There is suflicient elasticity inthe rolls and housings to cause them to yield when the colder endportions of the metal are inthe grip of the rolls and the consequence isthat the finished beam is apt to be irregular being of greatercross-sectional area at the ends than at the middle. My inventionovercomes these difiiculties. It produces a less percentage of defectivebeams, a more regular product and an increased output.

Referring to the drawings, 2 1) indicates a blooming mill in which theinitial passes are given to the ingot, the ingot being passed back andforth through this mill the desired number of times.

3 and 4 are universal mills of the kind heretofore employed, havinghorizontal rolls a, vertical rolls 7) which are set in the same verticalplane, and horizontal edging rolls 0 which are set in a diiferentvertical plane back of the rolls a and b.

5, 5 are reversing feed tables, 6 is an engine by which the bloomingmill 2 is driven and 7, 7 are motors for driving the universal mills 3and 4.

In practice the ingot to be rolled is first reduced in the blooming milland then is passed repeatedly through the rolls 3 until it is brought tothe desired cross-sectional area. It is then passed repeatedly throughthe second universal mill 4 until it is further reduced to the desiredcross-sectional area, but instead of finishing the beam in the mill 4 ashas heretofore been the practice, I then conduct the metal by a feedtable 5 to the continuous mill 8. This continuous mill is composed oftwo or more universal mills, 8, 8 and 8 set in tandem. Each of thesemills has horizontal rolls a and vertical rolls I) set in the samevertical plane, and horizontal edging rolls 0. The rolls are driven. byelectric motors 7, which operate at successively higher speeds, eachmotor driving its rolls more rapidly than the preceding mill, toaccommodate the elongation of the metal. The speed ofthe motor isregulated by controlling the current by which the motors are driven..When the metal piece has received its last pass at the universal mill 4it is conveyed lay the feed table 5 to the continuous train of universalmills8 and is passed therethrough in continuous fashion withoutstoppage. As shown in the drawings the mills of the continuous train arein close proximity so, that the metal piece or blank can be in two ormore mills at the same time. In this way the finishing of the metalpiece is accomplished very rapidly, and, the metal being finished whenit is hot and by the flow of the metal in the same direction, theirregular contraction of the thin flanges is pre vented and the finishedbeam is produced without the stresses mentioned above. The effect alsois to finish the beam at substantially the same temperature at differentportions of its length; and, the ends of the beam being substantially ashot as the middle portion of the beam, it is of approximately the samecross-section throughout its length. A very large output can be producedwith this mill.

The number of universal mills which con stitute the continuous train 8may be varied. I have shown three such mills, but if desired four or twomay be employed.

Inthe reversing mills 3 and 4 the blank is fed through and clear beyondthe rolls in each operation, on to the tables where it has only itsresidual heat to retard its cooling.

I11 the continuous mill however the blank is continuously engaged withthe rolls, the friction of which tends to keep it hot and the directionof rotation of which causes the metal to flow continuously in the samedirection and so avoids strains which would be due to reversals of theflow. Furthermore, the difliculties above referred to, due to thegreater coolness of the ends of the blank are serious only when theflanges and other parts of the shape have been rolled down quite thin,especially in the rolling of small sizes, and when the blank has beenexposed for a considerable time to the atmosphere. The first passes aretherefore executed while the metal is still comparatively fresh from theheating furnace and while it has a comparatively large cross-section, sothat advantage may be taken of the rapidly running reversing rolls andthe cost of the plant and the space occupied can be minimized; only thenicer, finishing, operation being performed in the continuous mill whichbrings the blank quickly to final shape before its ends have much timeto cool, by reason of the simultaneous engagement of the successiverolls with the blank at different points in its length.

I claim as my invention 1. A mill for rolling flanged beams including incombination a reversing universal mill and means for passing the blankback and forth through the same to partially reduce the blank, acontinuous mill comprising a plurality of universal mills in tandem andmeans for passing the blank from said'reversing universal mill to saidcontinuous mill, the

universal mills constituting said continuous mill operating in one andthe same direction, and means for driving said universal millsconstituting the continuous mill at successively increasing rates ofspeed corresponding to the elongation successively effected, the millsbeing adapted to operate on diiferent portions of such blanksimultaneously to reduce it to its finished dimensions rapidly in asingle pass.

2. A mill for rolling flanged beams including in combination a bloomingmill and means for passing a blank back and forth through the same, areversing universal mill and means for passing the blank from theblooming mill to said reversing universal mill and back and forththrough the same to partially reduce the blank, a continuous millcomprising a plurality of universal mills in tandem and means forpassing the blank from said reversing universal mill to said continuousmill, the universal mills constituting said continuous mill operating inone and the same direction, and means for driving said universal millsconstituting the continuous mill at successively increasing rates ofspeed corresponding to the elongation successively eifected, the millsbeing adapted to operate on different portions of such blanksimultaneously to reduce it to its. finished dimensions rapidly in asingle pass.

In testimony whereof, I have hereunto set my hand.

GEORGE G. MCMURTRY. Witnesses:

J. H. GRAY, ANNA E. WALLACE.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

